Governments often structure benefit programs and tax credits with a maximum value, a phase-out start, and a phase-out rate. For example, the US Supplemental Security Income program phases out with income at 50% above an exemption; from the OpenFisca US docs:
We model these with sets of parameters for maximum_amount, phase_out_start, and phase_out_rate (e.g. see the US Child Tax Credit), and then code structures like:
I'd suggest a parameter structure that captures these elements and automatically computes the value via phase_out_parameter.calc(income), in the vein of parameter scales. I think this would reduce code duplication and room for error.
Governments often structure benefit programs and tax credits with a maximum value, a phase-out start, and a phase-out rate. For example, the US Supplemental Security Income program phases out with income at 50% above an exemption; from the OpenFisca US docs:
We model these with sets of parameters for
maximum_amount,phase_out_start, andphase_out_rate(e.g. see the US Child Tax Credit), and then code structures like:I'd suggest a parameter structure that captures these elements and automatically computes the value via
phase_out_parameter.calc(income), in the vein of parameter scales. I think this would reduce code duplication and room for error.@nikhilwoodruff @rickecon